﻿using System.Collections.Generic;
using System.ComponentModel;
using Rxx.Labs.Properties;
using Rxx.Parsers.Linq;

namespace Rxx.Labs.Parsers.Interactive
{
	[DisplayName("Ambiguous")]
	[Description("Parses a string with an ambiguous grammar that matches two consecutive letters.")]
	public sealed class AmbiguousLab : BaseConsoleLab
	{
		protected override void Main()
		{
			TraceLine(Instructions.WaitForCompletion);

			IEnumerable<char> input = "abcde|fgh";

			IEnumerable<string> doubles = input.Parse(parser =>
				from next in parser
				let letter = next.Where(char.IsLetter)
				let twoLetters = letter.And(letter).Join()
				select twoLetters.Ambiguous());

			doubles.ForEach(ConsoleOutput);
		}
	}
}